Gaia white dwarfs within 40 pc – III. Spectroscopic observations of new candidates in the Southern hemisphere

Abstract

We present a spectroscopic survey of 248 white dwarf candidates within 40 pc of the Sun; of these 244 are in the Southern hemisphere. Observations were performed mostly with the Very Large Telescope (X-Shooter) and Southern Astrophysical Research Telescope. Almost all candidates were selected from Gaia Data Release 3 (DR3). We find a total of 246 confirmed white dwarfs, 209 of which had no previously published spectra, and two main-sequence star contaminants. Of these, 100 white dwarfs display hydrogen Balmer lines, 69 have featureless spectra, and two show only neutral helium lines. Additionally, 14 white dwarfs display traces of carbon, while 37 have traces of other elements that are heavier than helium. We observe 35 magnetic white dwarfs through the detection of Zeeman splitting of their hydrogen Balmer or metal spectral lines. High spectroscopic completeness (> 97 per cent) has now been reached, such that we have 1058 confirmed Gaia DR3 white dwarfs out of 1083 candidates within 40 pc of the Sun at all declinations.

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Item Type:	Article
Authors/Creators:	O’Brien, M.W. https://orcid.org/0000-0003-0928-4065 Tremblay, P.-E. Gentile Fusillo, N.P. Hollands, M.A. https://orcid.org/0000-0003-0089-2080 Gänsicke, B.T. https://orcid.org/0000-0002-2761-3005 Koester, D. https://orcid.org/0000-0002-6164-6978 Pelisoli, I. https://orcid.org/0000-0003-4615-6556 Cukanovaite, E. https://orcid.org/0000-0002-3184-3428 Cunningham, T. https://orcid.org/0000-0001-7296-3533 Doyle, A.E. Elms, A. https://orcid.org/0000-0001-7666-7416 Farihi, J. https://orcid.org/0000-0003-1748-602X Hermes, J.J. https://orcid.org/0000-0001-5941-2286 Holberg, J. Jordan, S. https://orcid.org/0000-0001-6316-6831 Klein, B.L. Kleinman, S.J. Manser, C.J. De Martino, D. Marsh, T.R. https://orcid.org/0000-0002-2498-7589 McCleery, J. Melis, C. Nitta, A. Parsons, S.G. https://orcid.org/0000-0002-2695-2654 Raddi, R. https://orcid.org/0000-0002-9090-9191 Rebassa-Mansergas, A. Schreiber, M.R. Silvotti, R. https://orcid.org/0000-0002-1295-8174 Steeghs, D. https://orcid.org/0000-0003-0771-4746 Toloza, O. https://orcid.org/0000-0002-2398-719X Toonen, S. Torres, S. Weinberger, A.J. Zuckerman, B.
Copyright, Publisher and Additional Information:	© 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This is an author-produced version of a paper subsequently published in Monthly Notices of the Royal Astronomical Society. Uploaded in accordance with the publisher's self-archiving policy.
Keywords:	stars: statistics; white dwarfs; solar neighbourhood
Dates:	Published: January 2023 Published (online): 12 November 2022 Accepted: 8 November 2022
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Depositing User:	Symplectic Sheffield
Date Deposited:	01 Feb 2023 11:11
Last Modified:	01 Feb 2023 11:11
Status:	Published
Publisher:	Oxford University Press (OUP)
Refereed:	Yes
Identification Number:	10.1093/mnras/stac3303
Related URLs:	Author arXiv URL
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:195923

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Gaia white dwarfs within 40 pc – III. Spectroscopic observations of new candidates in the Southern hemisphere

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